Metal shearing machine and the like



Nov. 2,1943- A. E. CARTLIDGE METAL SHEARING MACHINE AND THE LIKE- Filed Nov. 26, 1941 INVENTOR C d/12 M055 ATTORNE Y Patented Nov. 2, 1943 METAL; SHEARING MACHINE AND THE LIKE Alfred Edward Cartlidge, California in England;

' Woki'ngham, England ApplioationNovember 26, 1941, SerialNo. 420,594- In Great? Britain December 17,1940

2. Claims;

This invention relates tometalshearing machines and the like.

The object of this invention'is to provide a machine which will shear metal or other material of flat or intricate shapein-a quick and eificient manner.

A further object is to provide a shearing ma:- chine of simple character which will permit of the shaping of for instance the ends of metal tubes to any desired formation;

A still further object is to provide a shearing machine in which the movable cutter will operate at a high speed so asto providea nibbling or like effect to enable material to be .cut to intricate shapes upon the movement of .such material during the shearing operationl Withrtnese and other objects in viewthe in vention consists in providing a shear-ing machine com rising a pair of longitudinalf arm members pivoted together. at arr-intermediate position'gone end of said pair of members being fittedlwith cutting members andthe other end of said pair fitted with means such as cam, eccentric or like means mounted on a shaft adapted to be rotated at a high speed to actuate the cutters whereby to provide a nibbling effect during the shearing operation, the cutting faces being arranged substantially parallel to the axis of the pivot or fulcrum of the longitudinal arm members.

The invention further consists in providing positive or resilient means to maintain the movable arm member in contact with the cam or eccentric means.

The invention still further consists in detachably mounting the cutting members longitudinally in the arms, providing means for their longitudinal adjustment and in providing one of the arm members with means for securing to a bench or other support.

The invention will now be described with reference to the accompanying drawing in which:

Figure 1 is a sectional elevation of one form of shearing machine constructed according to this invention;

Figure 2 is a cross sectional elevation taken on the line a-a of Figure 1;

Figure 3 is a cross section taken on line bb of Figure 1;

Figure 4 is a detail of one of the cutting members adjustably mounted in the end of the upper arm member;

Figure 5 is a part sectional elevation of a modified construction and Figure 6 is an end view thereof.

As shown more particularly in. Figures. 1- too the improved shearing machine. comprises a base member in thefor-m of a longitudinal: arm formed intermediatelTy of? its-ends with a pair of upstandingspaced ears ZHadapted to carry. a fulcrum 3 for a furtherarm membered of substantially similar length to the lower arm I This latter arm: I is formedhwith-apertures vlugs or flanges 5 for bolting; to aebench-or other-support. To the forward-projectingpontipnsofythe arms.- llanddare fitted cutting or shearing'vmembers fii and 1': intheform of stems having-their cuttingv edges 8 andS arranged substantially: at right angles tow the: said arms I= and 4.- :These cutting members E'andfl arerconvenientlyl fitted in longitudinally arranged recesses on slots I0 and I l formed 'in thel ends of the arms-l and respectively. The lower: cutting nember- 6-having an upturned nose IZHto formithe-cutting: or shearing edge 8 is preferably fixed orsecured to its carrying arm I by screws B on by dowels or other convenient means.-- Theiupper cutting member l of substantially similar shape is preferably adjustably mounted in the recess or slot ll formed in the under side of the upper and movable arm 6. Conveniently the stem of this cutting member 7 is slotted at M for the reception of a guide and securing bolt I5 and the inner end of the stem is adapted to abut against adjusting means such as a pressure screw l6 screwed into the upper arm member 4, locking means such as a lock nut I! being fitted on the said screw It. Thus the upper cutting member 1 can be adjustably and detachably secured to the upper arm member 4 in such a manner as to permit an efficient shearing operation upon the downward movement of the upper cutter 1 in relation to the lower fixed cutter 6. The cooperating cutting edges 8 and 9 may be of any suitable shape either of angular or arcuate shape to permit of intricate shearing. The rear end of the base member I is formed with upstanding lugs i8 which are fit ed with antifriction bearings iii for a shaft 28 arranged at right angles to the said member I. This shaft 20 is fitted with a pulley 24 so that it may be rotated by power means but if desired the shaft 2|] may be manually operated. This power shaft 20 is also adapted to carry an eccentric 22 through the medium of an anti-friction bearing 23. This eccentric 22 is connected to a shaft or spindle 24 which is mounted in lugs 25 formed on the rear end of the upper arm 4. Thus the arm 4 will be rocked on its fulcrum 3 when the power shaft 20 is rotated. In an alternative construction as shown in Figures 5 and 6 the power shaft is fitted with a cam or the like 26 which is adapted to co-operate with a hardened surface 21 formed or provided on the under side of the upper arm member 4. Suitable spring means are provided to maintain the rear end of the upper arm member 4 on the outer surface of the cam 26. Conveniently this is effected by a pair of helically coiled tension springs 28 connected at their ends to the upper and lower arm members I and 4 at each side thereof preferably through the medium of side extending arms 29. If desired, the hardened rubbing surface 21 may be in the form of a slightly tapered plate adjustably fitted to the end of the upper arm memher 4 to contact with the cam 26. Thus the rub bing plate or surface 21 could be readily adjusted to vary the distance between the cutters 6 and 'l or to permit of the adjustment or replacement of the plate 21 when worn.

In a further alternative construction not shown the movable arm 4 may be positively rocked on its fulcrum 3 through the medium of an eccentric mounted on the power shaft and connected with the said arm 4 by an eccentric strap and a rod pivoted to the arm 4. Obviously the eccentric operation of the machine would obviate the use of springs. If desired means may be provided to adjust the length of the rod or the pivot thereof.

In operation it will be seen that when power is applied to rotate the shaft 20 the upper arm 4 will rock on its fulcrum 3 at a high speed and ticles by a shearing operation.

What I claim is: 1. A shearing machine, including a pair of Owing provide a nibbling effect to the cutter thereby enfaces.

arms mounted intermediate their ends for relative pivotal movement, means at one end of the arms to compel operative relative movement of the opposite end of the arm, and cooperating cutting members carried by said last mentioned ends of the arms, said cutting members being removably mounted in channels in th proximate faces spaced from and substantially parallel to the' edge of the cutting member carrying said nose, the adjustment of a cutting member permitting relative varying in cutting overlap longitudinally of the shearing surfaces to provide varying cutting shapes in successive operation and under proper adjustment of the cutting member.

2. A shearing machine, including a pair of arms mounted intermediate their ends for relative pivotal movement, means at one end of the arms to compel operative relative movement of the opposite end of the arms, and cooperating cutting members carried by said last-mentioned ends of the arms, said cutting members being removably mounted in channel in the proximate faces of the arms and extending beyond the adjacent ends of the arms, the extended ends of the cutting members having laterally offset accurately-aligned .noses extending toward each other and terminally formed to provide offset shearing surfaces, onev of said surfaces being of arcuate form in cross section, the cooperating shearing surface being fiat, the'respective noses being of th same width transversely to permit varying cutting cooperation of the shearing sur- ALFRED EDWARD CARTLIDGE. 

